book Maths Puzzle Numerical Ability

can you show me your method of doing this


-4x-12y-11z=-53
3x-5y-8z=-9
-9x-10y+7z=-24

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book Other Question

identify and write down the equation for a parabola that could represent a real life situation(e.g. a bridge). explore the way in which the equation and hence the model changes as determine the sum for the geometric sequence:
n=12 , r=3 , T1 = 1/9